Kevin Bacon will join Johnny Depp in the adaptation of the Whitey Bulger book “Black Mass,” according to Deadline. Bacon (inset), who’s no stranger to Boston (he was here for the filming of “Mystic River” and “R.I.P.D.”), will play FBI agent Charles McGuire, according to the Deadline story, which describes the role as “the FBI special agent in charge of the Boston field office and John Connelly’s [sic] boss.” As far as we know, there was no McGuire in real life. The “Black Mass” crew continued filming around Ashmont Grill in Dorchester on Thursday. Earlier in the week, actor Benedict Cumberbatch, who plays Whitey’s brother Billy Bulger in the Scott Cooper film, was spotted in front of the Harvard Club on Commonwealth Avenue.